US3804968A - Induction furnace - Google Patents

Induction furnace Download PDF

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Publication number
US3804968A
US3804968A US00264281A US26428172A US3804968A US 3804968 A US3804968 A US 3804968A US 00264281 A US00264281 A US 00264281A US 26428172 A US26428172 A US 26428172A US 3804968 A US3804968 A US 3804968A
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US
United States
Prior art keywords
coil
furnace
lining
vessel
induction furnace
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00264281A
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English (en)
Inventor
I Mosser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Austria Metall AG
Vereinigte Metallwerke Ranshoffen Berndorf AG
Original Assignee
Vereinigte Metallwerke Ranshoffen Berndorf AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vereinigte Metallwerke Ranshoffen Berndorf AG filed Critical Vereinigte Metallwerke Ranshoffen Berndorf AG
Application granted granted Critical
Publication of US3804968A publication Critical patent/US3804968A/en
Assigned to AUSTRIA METALL AKTIENGESELLSCHAFT reassignment AUSTRIA METALL AKTIENGESELLSCHAFT CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE 12/11/84 Assignors: VEREINIGTE METALLWERKE RANSHOFEN-BERNDORF AKTIENGESELLSHCAFT
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/367—Coil arrangements for melting furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/06—Induction heating, i.e. in which the material being heated, or its container or elements embodied therein, form the secondary of a transformer

Definitions

  • the furnace lining may be formed directly on this coil, and the coil is air [56] References Cited Cooled- UNITED STATES PATENTS 5 Claims, 5 Drawing Figures 3,401,226 10/1968 Renkey 13/26 '"-CONTROL i-MENTEHAPR 16 I974 3804368 INSULATION ALUMINUM iNnucTioN FURNACE FIELD OF THE INVENTION
  • the present invention relates to an induction furnace.
  • An induction furnace usually comprises a vessel adapted to receive a charge of metal or the like to be heated for smelting or a similar operation.
  • a coil formed of a hollow copper conductor surrounds this vessel and is connected to an alternating-current source. Energization of the coil creates a magnetic fieldin the vessel which generates eddy currents in the charge in order to heat it.
  • Another object is the provision of an induction furnace which is of inexpensive and simple construction, but which operates at a higher level of efficiency than the prior-art devices.
  • an aluminum conductor is substantially less expensive than a copper one, even though it will need to be somewhat heavier than a copper conductor of similar electrical capacity.
  • the elimination of a water cooling system also reduces the expense of the furnace substantially.
  • the coil is used as a base either for the cruicible lining or the crucible support.
  • the material is tamped or rammed in place right on the coil either on the inside or the outside, leaving each turn exposed on at least one side for air cooling.
  • FIG. l is a vertical section through a crucible induction furnace according to the present invention.
  • FIGS. 2 and 3 are top views of two types of air-cooled core-type or channel-type induction furnaces
  • FIG. 4 is a sectional view in enlarged scale showing a detail of the furnace of FIG. 1;
  • FIG. 5 is a perspective view of a coil according to the present invention.
  • a crucible lining 1 containing a charge 3 is surrounded by a coil 2 formed, as shown in FIG. 4 of a solid aluminum band 6 of rectangular section provided with an anodized aluminum-oxide coating 7.
  • the lining 1 is rammed in place on the coil 2.
  • the lining 1 can be rammed on the inside of the coil 2 in which case the cooling air is passed through the space 5 between the outer periphery of the coil 2 and the iron core 4.
  • FIG. 3 shows how the lining can be tamped against an independent cylinder so that the coil 2 may be free standing between the core 4 and the crucible I.
  • the lining l which forms the crucible may be formed on a support made of, for example, wood which is consumed when the furnace is heated up to simply leave the heat-resistant furnace lining.
  • the furnace may be provided as shown in FIG. 5 with a thermostat 10 which is connected through a control circuit III to the blower 8 and to the source 9 in order to reduce the current density in the coil 2 when the temperature of this coil 2 and the lining 1 rises above a predetermined limit.
  • the type of the lining and of the insulation coating 7 would determine just what the critical temperature is. This control would limit joule heat in both the conductor 6 and in the melt 3 as necessary.
  • An induction furnace comprising a vessel adapted to receive a charge of metal to be melted and a helical coil surrounding said vessel, said coil being formed of an elongated aluminum conductor provided with a heat-resistant anodized insulating coating; an alternating-current source connected to said coil; and means for forcing a current of air over said coil for cooling same.
  • An induction furnace comprising a vessel adapted to receive a charge of metal to be melted and a coil surrounding said vessel, said coil being formed of an elongated aluminum conductor provided with a heatresistant anodized insulating coating; an alternatingcurrent source connected to said coil; means for forcing a current of air over said coil for cooling same; a temperature sensor responsive to the temperature of said coil and connected to said source and to said means for forcing air over said coil for maintaining said coil below a predetermined temperature by controlling power output from said source and the output of said air-forming means.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Furnace Details (AREA)
  • General Induction Heating (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
US00264281A 1971-06-22 1972-06-19 Induction furnace Expired - Lifetime US3804968A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT539171A AT305665B (de) 1971-06-22 1971-06-22 Induktionsofen

Publications (1)

Publication Number Publication Date
US3804968A true US3804968A (en) 1974-04-16

Family

ID=3575271

Family Applications (1)

Application Number Title Priority Date Filing Date
US00264281A Expired - Lifetime US3804968A (en) 1971-06-22 1972-06-19 Induction furnace

Country Status (4)

Country Link
US (1) US3804968A (de)
AT (1) AT305665B (de)
CH (1) CH557630A (de)
DE (1) DE2228892A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191875A (en) * 1977-11-10 1980-03-04 Cunningham Ronald J Fan speed control used in induction cooking apparatus
US4421967A (en) * 1980-07-21 1983-12-20 Vs Systems, Inc. Windmill driven eddy current heater
US4820892A (en) * 1985-08-22 1989-04-11 Tetra Pak International Ab Heating arrangement for packing containers holding liquid contents
US5408073A (en) * 1993-02-20 1995-04-18 Samsung Electronics Co., Ltd. Overheat prevention circuit for electromagnetic induction heating cooker
GB2320573A (en) * 1996-12-19 1998-06-24 Ceramaspeed Ltd Electric heater and sensor
US6353213B1 (en) * 1998-08-07 2002-03-05 Bmg Holdings, Llc Voltage transformer type water heating unit
US20030196911A1 (en) * 2002-04-22 2003-10-23 Palmer Forrest M. Process and apparatus for smelting aluminum
CN102564124A (zh) * 2011-07-28 2012-07-11 郑坚明 一种工业用电磁熔炉

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183294A (en) * 1962-04-09 1965-05-11 Ohio Crankshaft Co Temperature control apparatus
US3311695A (en) * 1964-10-09 1967-03-28 Ohio Crankshaft Co Coil assembly for an induction melting furnace and method of making same
US3401226A (en) * 1965-10-24 1968-09-10 Dresser Ind Induction furnace having a composite lining composed of refractory brick
US3428771A (en) * 1964-11-20 1969-02-18 British Titan Products Plasma producing apparatus
US3474179A (en) * 1966-06-22 1969-10-21 Ass Elect Ind Metal melting or smelting apparatus
US3546649A (en) * 1968-05-29 1970-12-08 Metalloxyd Gmbh Convoluted conductor assembly and method of making the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183294A (en) * 1962-04-09 1965-05-11 Ohio Crankshaft Co Temperature control apparatus
US3311695A (en) * 1964-10-09 1967-03-28 Ohio Crankshaft Co Coil assembly for an induction melting furnace and method of making same
US3428771A (en) * 1964-11-20 1969-02-18 British Titan Products Plasma producing apparatus
US3401226A (en) * 1965-10-24 1968-09-10 Dresser Ind Induction furnace having a composite lining composed of refractory brick
US3474179A (en) * 1966-06-22 1969-10-21 Ass Elect Ind Metal melting or smelting apparatus
US3546649A (en) * 1968-05-29 1970-12-08 Metalloxyd Gmbh Convoluted conductor assembly and method of making the same

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191875A (en) * 1977-11-10 1980-03-04 Cunningham Ronald J Fan speed control used in induction cooking apparatus
US4421967A (en) * 1980-07-21 1983-12-20 Vs Systems, Inc. Windmill driven eddy current heater
US4820892A (en) * 1985-08-22 1989-04-11 Tetra Pak International Ab Heating arrangement for packing containers holding liquid contents
US5408073A (en) * 1993-02-20 1995-04-18 Samsung Electronics Co., Ltd. Overheat prevention circuit for electromagnetic induction heating cooker
GB2320573A (en) * 1996-12-19 1998-06-24 Ceramaspeed Ltd Electric heater and sensor
US6353213B1 (en) * 1998-08-07 2002-03-05 Bmg Holdings, Llc Voltage transformer type water heating unit
US20030196911A1 (en) * 2002-04-22 2003-10-23 Palmer Forrest M. Process and apparatus for smelting aluminum
US6855241B2 (en) * 2002-04-22 2005-02-15 Forrest M. Palmer Process and apparatus for smelting aluminum
CN102564124A (zh) * 2011-07-28 2012-07-11 郑坚明 一种工业用电磁熔炉

Also Published As

Publication number Publication date
AT305665B (de) 1973-03-12
CH557630A (de) 1974-12-31
DE2228892A1 (de) 1972-12-28

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Legal Events

Date Code Title Description
AS Assignment

Owner name: AUSTRIA METALL AKTIENGESELLSCHAFT

Free format text: CHANGE OF NAME;ASSIGNOR:VEREINIGTE METALLWERKE RANSHOFEN-BERNDORF AKTIENGESELLSHCAFT;REEL/FRAME:004432/0638

Effective date: 19850604